Can anyone explain to me how to replace the Crankshaft Pulley for my 93 Si Lude?

 

Jack up the car and replace the Driver's side wheel.

Detension and remove the alternator, power steering, and a/c belts if you have them.

Remove the big bolt in the driver side fender well holding the crank pulley on. I believe it's a 19mm, but it's different on some motors. The BEST way to get it off is to use an impact gun. You could use a bigass breaker bar if necessary. You may have to keep the motor from turning; one way to do this is to put the car in gear and have someone press the brakes hard while hitting the breaking bar.

Remove pulley and install new pulley in the opposite order.